Electric lamp



Patented Sept. 12, 1922. i

STATES ARTHUR CASE,OF MAR-ION, INDIANA, .PiSSIG-NOB. T0 DELTA ELECTRIC COMPANY,

'OFIMA-BION, INDIANA, A. CORPORATION OF INDIANA,

ELECTRIC LAMP.

Application filed. March 25, 1918.

To -allawlwm it -meyuconcern vBe itkno'wn that I, ARTHUR E. Case, a .citiZen'ofEtheUnited States, and a resident of Marion, win the "county of Grant and .State of- Indiana, have invented certain new .and nseful Improvements ,in Electric Lamps, of which the f-following is a full, clear. and .-.-exact description. I

The invention relates toelect-ric lamps and more; particularly-to the type commonly designated :;spot=lights=whioh are usually secured tozf avehiclevin such manner that the lamptmaya-beshifted to throw the luminous flux any ,desired edirection.

.One object-of :the' invention visto provide an improved lamp" of this. type in which the case 1 :o'r {shell is formed with projecting means at the rear whereby the lamp can be manipulated and which is 'adapated to contain va; -combined -..lamprfocusing and switchcontrolling device, v:where it 1 is protected :against accidental .shift.

LA further .object of the invention is. to :;provide a lamp with improved-means whereby it "maybe adjusted to focus the lamp uupon objects located different distances r-fr'om the lamp.

A still further object ;of the invention is t'o:,wprovide'arl-amp with improved switch- :contr0lling;.means. I

--Qther objectswill appearfrom the de scription.

The. invention consists in the several novel (featureshereinafterset forth and more particularly :defin'edby claims at the conclusion whereof.

In the drawings: Fig. 1,.is a rear elevationof -a-lamp embodying the invention. Fig. 2-is a side elevation. Fig. 2 is a detail perspectivepf'the lamp bracket. Fig. 3 .1S a-central vertical section through the lamp. Fig.- 4 is;.a detail of the switch lo- ;cated in the lamp casing for-controlling the incandescent lamp. -Fig.:.5-is a section taken on a line 55 of Fig. 3. Fig. 6 isa section taken on line 6 6 of Fig 4.

The :improvedlam comprises a hemispherical ,case7-r-whic is formed of sheet ,metal, a parabolic-:reflector 8 suitably secured in; the case,@afront;-lens 9' and a ring .10-whic'h'is removably connected to the case .71 and holds'thev lens and reflector in place, and an incandescent lamp 11 disposed in the caseyand in front. of :the reflector to operate in "manner well understood, in :the art.

Serial No. 224,470.

The lamp casing is pivoted to swing vertlcally in a yoke 12. Suitable studs and sprlng washer connections 13 between the upper ends of the lug 12 and the case 7 connect the case to the yoke so that the case can be swung vertically to project the light in the desired elevation and to frictionallv hold the lamp in assigned position. A depending post 14 fixed to the yoke 12, is pivotally mounted in a bracket 15 to permit the yoke 12 and the lamp 7 to be swung horizontally to project the rays of light in the desired direction. Spring washers 16 and nuts 17 frictionally hold the post 14 in a bracket 15, so that the yoke will be yieldingly held in assigned position. Bracket 15 is secured by screws 18 to a clamp which is adapted to be secured to a support, such as a windshield-frame 19. This clamp com prises a pair of members 20 and 21 which are preferably formed of sheet metal and provided with suitable jaws 22 to engage the frame 19. Thumb-screws 23 are adapted to draw the members together to secure them in said frame. The inner or contiguous faces of these clamp-members are formed with horizontal grooves 24 which communicate with vertical grooves 25 to serve as a holder for a conductor-cord 27 which supplies ourrent to the lamp. An outlet 26 for the cord is formed at the outer end of the channels 24. The vertical grooves 25 extend entirely. through the clamp so that the cord may pass into the bracket from above or below or so that the bracket may be reversibly used. A. lug 28 is fixed between the post 14 and the yoke 12 and a hole 28 therein serves as a guide for the conductor cord between the clamp and the lamp casing so that the cord cannot become misplaced or fouled. This construction of supporting device for the lamp case exemplifies one comprising a clamp bracket formed of sheet metal parts with channel .in which the conductor cord will be held so it will not become displaced.

The central or back position of. the case 7, which is formed of sheet metal, is countersun'k, as at 30, to form .an annular seat for a short spacer tube 31. Said tube is provided with projecting tongues 32 which extend through slots in the case and are upset or bent to fixedly secure the tube to the case. The rear end of this tube is provided with-tongues 33which pass through holes in a rearwardly opening cup-shaped member 34, which is adapted to serve as a handle for the lamp and also as a guard or shield for the switch and lamp controlling device contained therein. This method of forming and connecting the case and shell or cup exemplifies one which is adapted for sheet metal construction and which can be produced at a low cost.

A bearing sleeve is fixed to the front wall of the shell 34. A rod 36 is slidably and rotatably mounted in said sleeve. A suitable handle or thumb wheel 37 is secured to the rear end of the rod by a screw 38. A metallic disk 39 is connected to the front end of this rod as shown at 39, so that the disk and rod will m'ove together longitudinally and so that the rod may be rocked independently of the disk. A facing 40 of insulating material is fixed on the front of said disk by tongues 40. A tubular lampsocket 41 is secured to the insulating facing 40 and is adapted to receive and hold the base of the lamp 11 in manner well understood in the art, as exemplified by pins 42 on the lam base which are adapted to enter and be loc red in the angular slots 43 in the socket. The lamp-base is provided with the usual contacts, which are adapted to engage respectively contact-strips 43 and 44 which are suitably secured to the disk 39 and insulation 40, in such manner that there will be no electrical connection between them or with the disk 39.

with the switch-strip The lamp socket 41 is slidable in the reflector 8 and is insulated therefrom by a ring 48. Disk 39 and insulated facing 40 are held against rotation by the frictional engagement between the socket 41 and the reflector which is held against rotation in the casing, so that when the rod 36 is ro tated, the plate and disk 39 will not rotate with it. A switch strip 47 is suitably mounted on the facing 40 so it will be insulated from disk 39 and a conductor 45 is connected to said strip. The distal end of the switch-strip 47 is adapted to make contact 44 at 49, to establish a circuit through conductor 45, switchstrip 47 contact 49, strip 44, lamp 11, strip 43, and conductor 46; 7 An arm 50 is fixed to the rod 36 and is extended through an arcuate slot 51 in the disk 39 and insulation 40 and is provided with a sleeve 52 of iusulating material which is adapted to engage strip 47 to force its outer end into contact with contact 49. normally separated from the contact 49.

To operate the lamp, the thumb wheel 37 is rotated to shift arm 50, so, that the insulating sleeve 52 will operate the switch member 47 to close the circuit. Said sleeve is adapted to engage a seat or offset 53 in the switch 47 whereby the latter will hold the arm in position to keep the circuit closed.

Strip 47 is resilient and is ported for'this purpose and can be shifted by moving the thumb wheel '37 forwardly or backwardly as desired. Such shift cause's the lamp holder, switch and the thumb wheel to be shifted conjointly; To yieldingly lioldthe lamp in its fore-and-aft adjustment, the rod 36 is formed with annular grooves 60 and a dete'nt61 guided in a bracket .62 is pressed towards the rodby a-coilspring'63. The grooves 60 "and the active end of the detent are V-shaped so that by the application of suflieient force the rod willsli'p over the detent.

' This construction exemplifies a device in which the rod is adjustably and yieldingly held in the desired'position. 1

The invention also exemplifies a lamp in which'the switch for the lamp is disposed in the body of the lamp 'casingwhere there is sufiicient room for a large switch and platelike support, ascontradistingnished from a switch disposed in the rearward extension or handle of the'lampu i This construction also exemplifies one-in which a slidable and rotatable rod serves to operate both the switch and the lamp. The open ended shell or member 34-can be conveniently gripped by putting the palm of the hand fiatwise against the-back and placing the fingers around-the front of the shell, and when thus gripped, a wide latitude of movement is possible- The invention is not to be understoodas restricted to the details set forth, since these may be modified within the-"scope ofthe appended. claims," without departing from the spirit and scope of the invention.

' Having thus described the invention, what 101mm its d'desire tosecureby ettersPate ti a I I y 1. In a lamp of the character described, the combination of a cas1ng,'arodconta1ning a member on and projecting rearwardly from the casing, a socket-supporting disk in the casing, an incandescent lamp socket mounted on the disk, a switch for the lamp, and a rod rotatably held in the member and having means to shift the'switch'.

2. In a lamp of the charactcr described, the combination of a casing, a rod containing member on and projecting rearwarding member on and projecting rearwardly 1y from. the casing, a socket-supporting from the casing, a socket-supporting disk disk in the casing, an incandescent lamp in said case, an incandescent lamp socket socket mounted on the disk, a switch for the on the disk, a switch for the lamp on the 5 lamp, contacts for engaging a lamp mountdisk andinsulated therefrom, and a slidable 15 ed on and insulated from said disk, and a ,and rotatable rod connected to shift said disk rod rotatably held in the member and havbodily, and means for operating the switch ing means to shift the switch. when the rod is rotated.

3. In a lamp of the character described, 10 the combination of a casing, a rod contain- ARTHUR E. CASE. 

